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    Wyświetlanie 1-6 z 6
    Tytuł:
    On the value function for multi-isotope mixtures separation
    Autorzy:
    Palkin, V. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/347060.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    isotope separation
    value function
    multi-isotope mixtures
    Opis:
    One of the possible approaches to the introduction of the value function in the case of multi-isotope mixtures is presented. It is based on a simplified model of separation processes in cascades and elements with multiplication of elementary effects of separation. A differential equation, being a necessary condition of the determination of the value function, is derived from the analysis of this model. Its general solution contains arbitrary constants which should be obtained considering boundary conditions and specific features of the separation process. Additional conditions concerning use of the found solutions in cascade criteria of an estimation of separation efficiency are stipulated. The applicability of various kinds of the value function forming at different conditions is analyzed. The forms of the value function which reflect best the optimal cascade with assigned external concentrations of the desired isotope and the matched abundance ratio cascade (MARC) are established.
    Źródło:
    Ars Separatoria Acta; 2004, 3; 51-61
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Isotope effects of gallium and indium in cation exchange chromatography
    Autorzy:
    Dembiński, W.
    Herdzik, I.
    Skwara, W.
    Bulska, E.
    Wysocka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/146163.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    isotope separation
    chemical isotope effect
    ion-exchange chromatography
    Opis:
    The isotope effects of gallium (69/71Ga) and indium (113/115In) have been determined in the system: strong cation exchanger (Dowex 50-X8)/HCl. The sings of gallium and indium effects were opposite, i.e., the heavier isotope of gallium was fractionated into the resin phase, while the heavy isotope of indium was fractionated into the liquid phase. The values of unit separation gains were found to be +3.0 ´ 10-5 for gallium and –2.0 ´ 10-4 for indium. A possible explanation of the effects is proposed.
    Źródło:
    Nukleonika; 2006, 51, 4; 217-220
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The theory of isotope separation in cascades: problems and solutions
    Autorzy:
    Borisevich, V. D.
    Sulaberidze, G. A.
    Wood, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/347051.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    isotope separation
    cascade
    binary and multicomponent mixtures
    Opis:
    The status of the theory of isotope mixture separation in cascades is presented. The problems that limit the concept of an ideal cascade in the case of separation of binary mixtures and arbitrary separation factors at cascade stages are discussed. A new type of separating cascades which have a total flow less than the flow of the corresponding ideal cascade is presented. Furthermore, these “optimum” cascades may permit mixing concentrations and still produce higher cascade separative work. In the paper, a criterion to define efficiency for the separation of multi-isotope mixtures is analyzed. The analysis is based on the concept of the match-abundance ratio cascade (MARC). The approach has demonstrated that in order to obtain the optimum parameters of a single stage in a cascade it is necessary to minimize the linear combination of the inverse values of “partial separative powers” for all mixture components.
    Źródło:
    Ars Separatoria Acta; 2003, 2; 107-124
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Working parameters of the electron - beam-generated ion source for ISOL facilities
    Autorzy:
    Yushkevich, Y. V.
    Turek, M.
    Mączka, D.
    Pyszniak, K.
    Słowiński, B.
    Vaganov, Y. A.
    Zubrzycki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146648.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    on-line isotope separation
    short-lived nuclides
    nuclear spectroscopy
    ion sources
    Opis:
    An electron-beam generated plasma (EBGP) ion source for nuclear spectroscopy purposes at YASNAPP (YAdernaya Spektroskopya NA Putchkah Protonov - nuclear spectroscopy using proton beams) isotope separation on-line facility is presented. Working conditions both in on- and off-line mode are presented and discussed. Formation of a potential trap inside a discharge chamber is an advantage of the presented construction, enabling relatively high ionization efficiencies (2-5%) even for hard-to-ionize elements like Be, Ti, V, Zr, Nb, Mo, Tc, Ru, Rd, Hf, Ta, W, Re, Os, Ir, Pt. The paper presents estimation of critical values of working parameters that enable formation of the ion trap leading in consequence to high efficiency of ionization. The optimal temperature of the discharge chamber and cathode walls is found to be in the range 2600-2800 K. Calculations of the output rates of ions produced in the on-line mode are also presented as well as the constraints on the half-life time of obtained nuclides imposed by construction details like the target material and its thickness.
    Źródło:
    Nukleonika; 2012, 57, 3; 351-356
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical study on extraction of tritium generated in HMR by way of system composed of EXEL-process and thermal diffusion column cascade
    Autorzy:
    Shimizu, M.
    Takeshita, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/146995.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    chemical exchange reaction
    heavy water
    isotope separation
    thermal diffusion
    trickel-bed reactor
    tritium
    Opis:
    A new tritium extraction system composed of a trickle-bed hydrogen/water isotopic exchange column using a hydrophobic Pt-catalyst combined with an SPE-water electrolyser (EXEL-process) and a thermal diffusion column cascade was proposed for the removal of tritium from heavy water irradiated in HMR ((Heavy Water Moderated Power Reactor), volume of heavy water = 140 m3 and mean neutron flux = 5×1013 n/cm2s). Numerical study on the extraction of tritium from the heavy water was carried out and the dimensions of proposed system were determined under the conditions that the concentration of tritium in the heavy water was kept less than 2.5 Ci/lHW. The calculation results indicated that the proposed system was designed practically.
    Źródło:
    Nukleonika; 2002, 47,suppl.1; 89-93
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On one analytical solution of the mass transfer problem in multistage installations with constant cut numbers
    Autorzy:
    Sulaberidze, G. A.
    Borisevich, V. D.
    Guliev, D. Zh.
    Powiązania:
    https://bibliotekanauki.pl/articles/346985.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    multicomponent isotope mixture
    separation cascade
    cut number
    mass transfer regularities
    Opis:
    Separation of binary isotope mixtures in multistage installations consisting of separation elements with constant cut numbers and separation factors is considered. The analytical solution for component concentration distributions over a cascade with constant cut numbers is obtained. Major mass transfer regularities in such a kind of cascades are reviewed.
    Źródło:
    Ars Separatoria Acta; 2003, 2; 7-17
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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